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2021 2nd International Conference on Mechanical Engineering and materials, ICMEM 2021

作者： Jiang, Tao Zhang, Bing Mao, Yimeng Cheng, Jiale Shi, Xiaodong AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of Aviation Industry Corporation of China Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China New Era Engineering Consulting Co. Ltd. Beijing100088 China

Trace and fracture analysis, metallographic examination, residual stress testing, and material analysis were carried out, coupled with examining the failure timeline, to analyze the cracking problem of 12CrNi3A steel counterweight blocks under multi-factor coupling. The results show that the cracks of the counterweight blocks are intergranular microcracks in the carburized layer and they are delayed cracks under the joint action of microstructure stress, grinding stress and hydrogen. The delayed cracking of the counterweight blocks is mainly related to abnormal hydrogen absorption during surface treatment and poor grinding quality. The obvious microstructure segregation in raw material and the thicker carburized layer promoted the cracking. The following measures should be comprehensively taken to prevent such failure: strictly controlling raw material quality, hydrogen absorption and stress, as well as increasing the processes to remove hydrogen, reduce stress and stabilize microstructure. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Grinding (machining)

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3DStrainOrientationCalculator: a 3D diffraction data analysis tool for single-crystal substructure information extraction

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Journal of Applied Crystallography 2025年第3期58卷 1050-1060页

作者： Pucong Sheng Shengyi Zhong Arsen Goukassov Baihua Wang Hao Lin Nan Li Wei Huang Shanghai Jiao Tong University SJTU Paris Elite Institute of Technology Shanghai 200240 People's Republic of China Shanghai Jiao Tong University School of Materials Science and Engineering Shanghai 200240 People's Republic of China National Key Laboratory of Neutron Science and Technology Shanghai People's Republic of China CEA-CNRS CE-Saclay Laboratoire Léon Brillouin Gif-sur-Yvette 91191 France AECC Beijing Institute of Aeronautical Materials Beijing People's Republic of China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing People's Republic of China Aero Engine Corporation of China Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing People's Republic of China HiSilicon Technologies Co. Ltd Shanghai 201206 People's Republic of China

Neutron diffraction is a crucial non-destructive technique for obtaining statistical information on the bulk properties of engineering materials. The program 3DStrainOrientationCalculator ( 3DSOC ) is an innovative analytical tool designed to extract substructure information, including lattice strain and subgrain orientation, from single crystals (SCs) using monochromatic neutron diffractometer data. By separating subgrain diffraction via rocking curve analysis and employing 2D curve fitting on original diffraction data, 3DSOC accurately determines the diffraction intensity of individual subgrains while minimizing the impact of scanning step size on the final fitting results. It reduces the standard deviation of the fitting result's statistical error from the order of 10 −3 to around 10 −5 . Additionally, 3DSOC extends its capabilities to the analysis of dual-phase SCs, where the lattice parameters of both phases are maintained with an accuracy of 10 −4 nm, comparable to conventional methods. This study applies 3DSOC to SiC SCs and Ni-based SC superalloys, measured using two different diffractometers, and discusses the resulting improvements.

关键词： neutron diffraction 3DSOC single-crystal studies subgrain properties two-dimensional curve fitting computer programs

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Quantitative characterization of heat treatment response in a single crystal nickel-based superalloy 2nd

Quantitative characterization of heat treatment response in ...

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2nd International Conference on Advanced materials, Processing and testing technology, AMPTT 2020

作者： Wei, Zhenwei Liu, Changkui Li, Yao Chen, Bingqing AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation AECC Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

ISBN: (纸本)9783035737400

To study quantitatively the effect of heat treatment on the microstructure, composition and mechanical property in a new single crystal nickel-based superalloy for industrial gas turbine (IGT) applications, the eutectic fraction, carbide fraction, and the fraction, size, shape and distribution of the γ´ phase was characterized by quantitative metallographic method, the evolution of chemical composition and hardness between core and inter dendrite was tested through EMPA and Nanoindentation. The experimental results indicate that: The eutectic fraction decreases from (0.52±0.08) % to (0.03±0.01) %. The carbides fraction decreases from (0.23±0.04) % to (0.12±0.03) %, and Feret ratio decreases from 3.21±2.54 to 2.14±0.98. The γ´ fraction increases from (55.66±4.18) % to (73.78±3.24) % in core dendritic region, from (64.82±1.44) % to (70.11±3.10) % in inter dendritic region. The γ´-size is 406±111(nm) in core dendritic region and 918±384(nm) in inter dendritic region before heat treatment, 359±69(nm) in core dendritic region and 361±57(nm) in inter dendritic region after heat treatment. The γ´-cuboidal degree is 1.08±0.20 in core dendritic region and 1.14±0.23 in inter dendritic region before heat treatment, 1.08±0.19 in core dendritic region and 1.02±0.14 in inter dendritic region after heat treatment. The solidification segregation coefficient of main segregation elements, such as Re, W, Hf, Ta, Al, and Mo, is closer to 1, with an average decrease of 27% after heat treatment. The hardness and modulus increase in core and inter dendritic, and their inhomogeneity is reduced between cores and inter dendritic. The improvement of properties result from the improvement of size uniformity and cuboidal degree of γ´, and the reduction of carbides and eutectic through element homogeneity during heat treatment. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Eutectics

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Predicting New Single/Multiphase Structure High Entropy Alloys by Pattern Recognition Network

SSRN

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SSRN 2022年

作者： Wang, Jiayu Liu, Ke Li, Xing Shi, Ruya Guo, Xuan Tian, Wenhan Yu, Huichen Wu, Su Jun School of Materials Science and Engineering Beihang University Beijing100191 China Science and Technology on Advanced High Temperature Structural Materials Laboratory AECC Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing100095 China Intl. Research Center for Advanced Structural and Biomaterials China

The phase structures of a dataset of 634 set high entropy alloys (HEAs) were predicted by machine learning methods and classified into four categories: bcc, fcc, bcc+fcc and others (containing intermetallic compounds and other structural alloys). The algorithm was a Pattern Recognition Network (PRN) using the cross-entropy as loss function, which could predict the phase formation probability of HEAs. The PRN algorithm was proved to be over 87% accurate on the test data. With the increase of Al content in AlxCoCu6Ni6Fe6 and AlxCoCrCuNiFe HEAs, the transformation from fcc to fcc+bcc and then to bcc structure was successfully predicted by the PRN algorithm. Meanwhile, the AlxCoCu6Ni6Fe6 (x=1,3,6,9) HEAs were also prepared and characterized, the experimental results showed that the phase structures were highly consistent with the prediction. © 2022, The Authors. All rights reserved.

关键词： Phase structure

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Influence of quasi-beta heat treatment on acoustic behaviors of ultrasonic inspection of TC4-DT alloy

Influence of quasi-beta heat treatment on acoustic behaviors...

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2020 IEEE Far East Forum on Nondestructive evaluation/testing: New technology and Application, FENDT 2020

作者： Gao, Xiang-Xi Wu, Su-Jun Tao, Chun-Hu Beijing China AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Aviation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Beijing China

ISBN: (纸本)9781665440820

The microstructure and microtexture of TC4-DT alloy before and after quasi-β heat treatment are investigated, as well as the influence on the acoustic behaviors of ultrasonic inspection. C-scan ultrasonic images are obtained to investigate the evolution of microstructure confirmed by metallography and electron backscatter diffraction (EBSD) analysis. Noise level and signal-to-noise ratio (SNR) of ultrasonic inspection are also quantitatively verified. The results show that when TC4-DT alloy undergoes quasi-β heat treatment, attenuation and scattering of acoustic energy is significantly different. During this process, the scattering mechanism of acoustic changes from Rayleigh scattering to Phase scattering, which is mainly controlled by the grain size. Under the same scattering mechanism with the uniform average grain size, however, the regions of a-phase crystallites with a certain orientation contribute to the scattering of the acoustic wave. This finding is helpful for estimating ultrasonic inspection ability of large components. © 2020 IEEE.

关键词： Heat treatment

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Carburized Layer Cracking Analysis of Counterweight Blocks of Speed Controller

Carburized Layer Cracking Analysis of Counterweight Blocks o...

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作者： Tao Jiang Bing Zhang Yimeng Mao Jiale Cheng Xiaodong Shi AECC Beijing Institute of Aeronautical Materials Failure Analysis Center of Aviation Industry Corporation of China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero engine corporation of China

Trace and fracture analysis,metallographic examination,residual stress testing,and material analysis were carried out,coupled with examining the failure timeline,to analyze the cracking problem of 12 CrNi3 A steel counterweight blocks under multi-factor *** results show that the cracks of the counterweight blocks are intergranular microcracks in the carburized layer and they are delayed cracks under the joint action of microstructure stress,grinding stress and *** delayed cracking of the counterweight blocks is mainly related to abnormal hydrogen absorption during surface treatment and poor grinding *** obvious microstructure segregation in raw material and the thicker carburized layer promoted the *** following measures should be comprehensively taken to prevent such failure:strictly controlling raw material quality,hydrogen absorption and stress,as well as increasing the processes to remove hydrogen,reduce stress and stabilize microstructure.

关键词： Carburized layer Intergranular crack Delayed cracking Multifactor coupling Abnormal hydrogen absorption Grinding defects Microstructure segregation

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Mirror aided ultrasonic testing of the bonding interface of dual-alloy blisk through the bore

Mirror aided ultrasonic testing of the bonding interface of ...

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2020 IEEE Far East Forum on Nondestructive evaluation/testing: New technology and Application, FENDT 2020

作者： Sha, Zheng-Xiao Gang, Tie Liang, Jing Han, Bo State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin China AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing China

ISBN: (纸本)9781665440820

Welded dual-alloy blisks have found more and more applications in aeroengines for their excellent high temperature performance. However, defects may develop within the bonding interface and threat the safety of the engine. In this paper, the ultrasonic testing of the bonding interface was investigated in the dual-alloy blisk with a small bore. Aided by a 90 degrees mirror, the longitudinal wave was introduced to the interface. Simulations and theoretical analyses were performed to explain the propagating behavior of the sound beam upon the strongly curved surface. It was observed when the focus of the probe approaches a certain point, the beam distortion was compensated under 'acoustic lens effect'. The cylindrical focused probe was found to give better performance than flat probes and spherical focused probes in terms of sensitivity and resolution. The experiments on a mock-up sample showed that 0.8mm FBH and Φ0.4mm SDH at the bonding interface were detectable with a 15MHz cylindrical focused probe. © 2020 IEEE.

关键词： Probes

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Effect of high temperature treatment in ar atmosphere on the tensile strength and structure of SiC fiber 2nd

Effect of high temperature treatment in ar atmosphere on the...

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2nd International Conference on Advanced materials, Processing and testing technology, AMPTT 2020

作者： Fan, Jinjuan Zhu, Qiangqiang Qi, Zhe Ye, Jinfa Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation AECC Beijing100095 China Fujian LEADASIA new materials limited company Fujian362000 China

ISBN: (纸本)9783035737400

. The properties and structure changes of SiC fiber in high temperature determine the service temperature of the reinforced ceramic matrix composites, so the properties of SiC fibers under high temperature are very important. The SiC-A and SiC-B fibers were treated at 1200, 1350 and 1600°C in Ar atmosphere. Then the tensile strength was measured, the microstructure and composition of the fibers were analyzed by SEM, EDS, XRD and AES. The results show that the tensile strength of SiCA and SiC-B decrease slowly at 1200 and 1350°C, but decrease rapidly at 1600°C. The tensile strength of SiC-B fiber decreases less slowly than that of SiC-A fiber. The grain size and the C-enriched region thickness of SiC-A and SiC-B fibers have little change under 1200 and 1350°C, but increase quickly at 1600°C. The decrease of the tensile strength of SiC-A and SiC-B fibers is mainly related to the growth of β-SiC grains. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Silicon carbide

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Effects of building orientation on fatigue behavior of Ti-6Al-4V alloy produced by selective laser melting

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key Engineering materials 2019年 795卷 208-214页

作者： Xu, Rui Da Yu, Hui Chen AECC Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing100095 China

Addictive manufacturing (AM) allows for the layer-by-layer fabrication of components via sequential material deposition and it is of immediate interest in many applications, in particularly aviation field. This work is tackling the issue that the influence of the inner-defects and building orientations on the fatigue behavior of Ti-6Al-4V Alloys produced by Selective Laser Melting (SLM). Specimens were built in two orientations (horizontal and vertical to the substrate) in order to evaluate the impact of the induced anisotropy of fatigue properties. A series of fatigue tests at stress ratio R=-1 are conducted at 400°C. Scanning Electron Microscopy (SEM) is used to examine the fracture surfaces of fatigue specimens to qualify the failure mechanism and crack initiation sites, which are most likely attached to the surface defects. The fracture surface analysis of HCF specimen tested that most of the crack initiates from the defect under subsurface. The results of this study imply that the fatigue properties at 400℃ are highly dependent on the specimen orientations relative to build directions, as the defects close to surface are the mainly cause of the crack initiations. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Scanning electron microscopy

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Research on fatigue failure mode and failure theory of rubber 7

Research on fatigue failure mode and failure theory of rubbe...

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7th International Conference on Energy technology and materials science, ICETMS 2021

作者： Wang, Zhanbin 1AECC Beijing Institute of Aeronautical Materials Beijing 100095 China 2Failure Analysis Center of Aviation Industry Corporation of China Beijing 100095 China 3Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing 100095 China a284495778@***

The rubber products are usually used in the condition of periodically complicated stresses, and their anti-fatigue function is simultaneously dependent on their viscoelasticity and the emergence and propagation of cracks directly effecting on the life of rubber products. Therefore, the research on fatigue failure of rubber products has important significance to improve their durability and safety. The research on fatigue failure of rubber has important significance to improve the durability and safety of rubber products. The fatigue failure mechanism of natural rubber was explained from the point of molecular motion theory and phenomenological theory. The application of test research methods in the study of rubber fatigue microstructure and the influence of environmental factors on the fatigue properties of natural rubber were studied, and the future development direction of natural rubber fatigue was also forecasted. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Durability

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